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Method for recycling zinc and cadmium in waste alkali slag

A technology of alkali residue and concentrated sulfuric acid, which is applied in the direction of improving process efficiency and the like, can solve the problems of cadmium smelting alkali residue polluting the environment and wasting resources, and achieves the effects of good economic benefits, good environment and good social benefits.

Inactive Publication Date: 2020-01-17
BAIYIN NONFERROUS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of environmental pollution and waste of resources by cadmium smelting alkali slag, and propose a method for comprehensive recovery and utilization of zinc and cadmium by alkali slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] This embodiment is a method for comprehensively recycling zinc and cadmium from alkali slag. The main components in alkali slag are: Zn: 23.47%, Cd: 39.52%.

[0013] (1) Take 450 grams of alkali slag, add water to the alkali slag at a liquid-solid volume ratio of 5:1, and heat it to a water temperature of 70°C. At the same time, slowly add concentrated sulfuric acid. When the pH value of the solution is ≤4.5, stop adding concentrated sulfuric acid and continue the reaction. , when the pH value of the solution is higher than 5.0, add concentrated sulfuric acid until the pH value is 4.5, stop adding concentrated sulfuric acid, repeat the above adding process of concentrated sulfuric acid, when the pH value of the pulp is stable between 4.5-5.0 for 30 minutes, stop the alkali For the slag pickling operation, the final pH value of the pulp is 4.5, and the whole pickling process lasts for 1.0h; the purpose of this process is to make the soluble substances such as zinc, sodium...

Embodiment 2

[0018] This embodiment is a method for comprehensively recycling zinc and cadmium from alkali slag. The main components in alkali slag are: Zn: 29.92%, Cd: 34.82%.

[0019] (1) Take 320 grams of alkali slag, add water to the alkali slag at a liquid-solid volume ratio of 5:1, and heat it to a water temperature of 70°C. At the same time, slowly add concentrated sulfuric acid. When the pH value of the solution is ≤4.5, stop adding concentrated sulfuric acid and continue the reaction. , when the pH value of the solution is higher than 5.0, add concentrated sulfuric acid until the pH value is 4.5, stop adding concentrated sulfuric acid, repeat the above adding process of concentrated sulfuric acid, when the pH value of the pulp is stable between 4.5-5.0 for 30 minutes, stop the alkali Slag pickling operation, the final pH value of the pulp is 4.5, and the whole pickling process lasts for 1.0h.

[0020] (2) Wash the dissolved pulp in step (1), and physically separate the liquid pulp...

Embodiment 3

[0024] This embodiment is a method for comprehensively recycling zinc and cadmium from alkali slag. The main components in alkali slag are: Zn: 29.21%, Cd: 36.12%.

[0025] (1) Take 410 grams of alkali slag, add water to the alkali slag at a liquid-solid volume ratio of 5:1, and heat it to a water temperature of 70°C. At the same time, slowly add concentrated sulfuric acid. When the pH value of the solution is ≤4.5, stop adding concentrated sulfuric acid and continue the reaction. , when the pH value of the solution is higher than 5.0, add concentrated sulfuric acid until the pH value is 4.5, stop adding acid, repeat the above adding process of concentrated sulfuric acid, when the pH value of the ore pulp is stable between 4.5-5.0 for 30 minutes, end the alkali slag For pickling operation, the final pH value of the pulp is 4.5, and the whole pickling process lasts for 1.0h.

[0026] (2) Wash the dissolved pulp in step (1), and physically separate the liquid pulp and lumps. Th...

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PUM

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Abstract

The invention discloses a method for recycling zinc and cadmium in waste alkali slag, and belongs to the technical field of smelting project by-product recycling. A high-temperature washing-physical screening-manganese dioxide oxidation-hot acid leaching method is adopted for treatment. The alkali slag generated through a cadmium producing system is washed at the high temperature, washing dissolved ore pulp is obtained, liquid ore pulp and blocky objects are obtained through physical screening, the liquid ore pulp is subjected to manganese powder oxidation and high-temperature leaching, the zinc and the cadmium in the liquid are leached into the liquid for the maximum degree, corresponding wet process procedures are repeatedly conducted, recycling of the zinc, the cadmium and other valuable metal resources is guaranteed, and good economic benefits are achieved. Through alkali slag recycling, alkali slag stacking and storing are reduced, and environment pollution is reduced.

Description

technical field [0001] The invention belongs to the technical field of recovery and utilization of smelting engineering by-products, in particular to a method for comprehensive recovery and utilization of zinc and cadmium in alkali slag. Background technique [0002] Alkali slag is a kind of pyrometallurgical slag produced during the process of melting cadmium clusters to produce crude cadmium. Its main components are cadmium, zinc and sodium. , zinc and sodium mainly exist in the form of sodium zincate. Assuming that the production capacity of zinc products reaches 220,000 tons, alkali slag is a hazardous waste produced in the hydrometallurgy zinc purification process, with an annual output of about 40 tons, of which zinc, cadmium and other valuable metals account for more than 55%. Such a large amount of alkali slag will not only cause resource loss and waste, but also cause certain pollution to the environment, so the comprehensive recovery of alkali slag is imperative. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B19/30C22B17/00
CPCC22B7/007C22B7/008C22B17/04C22B19/22C22B19/24C22B19/30Y02P10/20
Inventor 冶玉花崔耀刘骁龙崔金虎王庆西
Owner BAIYIN NONFERROUS GROUP
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